Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/20116#discussion_r159472368
--- Diff:
sql/core/src/main/java/org/apache/spark/sql/execution/datasources/parquet/VectorizedParquetRecordReader.java
---
@@ -248,7 +248,10 @@ public void enableReturningBatches() {
* Advances to the next batch of rows. Returns false if there are no
more.
*/
public boolean nextBatch() throws IOException {
- columnarBatch.reset();
+ for (WritableColumnVector vector : columnVectors) {
--- End diff --
This is the standard java foreach code style
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